Grease trap



Nov. 29, 1927.

' E. A. BELL GREASE TRAP Filed July 25, 1924 system.

Patented Nov. 29, 1927.

UNITED, "STATES Enwnvn; BELL, 0F PHILADE PHIA, PENNSYLVANIA.

. GEEAsE TRAP.

-App1ication filed July 23,

The object of this invention is to provide a grease trap or interceptor which by reason of novel construction and mode of operation possesses an extremely high efficiency.

A subsidiary object of theinvention is to. provlde-jmeans whereby the intercepted grease is automatmally separated from the.

heavier sediment and foreign matters which may findtheir way-into the trap.

The invention further provides for the subsequent recovery of the said sediment in order to obtain therefrom any articles of value which .through accldent havei'ound their way into the drain line, and for interception of such solid matter and sediment as may be undesirable to pass into the drainage A further 7 provide xmeans whereby the intercepted grease is accumulated in thetop of the trap in the form of a mat partially separated from the sidesof thel-tanlrand capable of.

being dipped out.-

The invention contemplates in its opera-l tion the use of awh rlpool principleand its associated centrifugal action tending to maintain the lighter constituents of the draining liquid including the grease at the center and top of the trap and forcing the water and heavier elements toward the outside. This action gives rise to theformation of a mat at the top of .the whirling liquid consisting of thelighter elements and including the grease. Driven outwardly toward the periphery of the whirlpool, the heavier sedimentandextraneous matter is adapted to accumulate in the bottom of the trap to be thereafter collected and examined for possible valuable articles accidentally finding their way into the drain. Accumulation of the grease in the form of a mat at the top of the trap andof the sediment in the bottom of the trap leaves the comparatively pure water free to be carried on through-normal drain outlets provided" for that purpose. I

A grease trap made in accordance with the principle hereinbefore set forth is illustrated in the accompanying drawings, in which:

Figure 1 is a vertical section of a trap made in accordance with my invention, and Fig. 2 is a section on the line 2-2, Fig. 1. Asillustratedin the drawings, the trap in its preferred form may comprise a cylindrical container I provided with a detachable cover 2, and having 'in'its sides an inlet port object of the invention isto 1924.. Serial n6. 727,820.

Sand an outlet 4 preferably somewhat lower than the intake. In these ports are secured ducts or pipes 5 and 6 respectivejly,-which' constitute part ofthe drainage system to which the trap maybe applied. 7 As clearly illustrated, the .intake'port3, located near; the top of the container,opens into a cylindrical well 7, having at one side and con-, tiguous to the wall of the container an opening or port 8 The curved Wall of the well 7 constitutes a deflector for the. liquid enter ingthrough the pipe5 and the port '3, and 1 effects adischarge of the liquid through the port 8 in a direction substantially tangential to the inner cylindricalsurface of the container, as indicated by the arrows in Fig.2. It will be apparentfthat by this. means the liquid in the interior of thetrap is givena rotary motion in the nature of a whirlpool, with the result, aforedescribed, that the grease and lighjtersubstancesi are automaticallylaccunnilatedin a mat in the center of the container. Under these circumstances, the water andthe heavier sediment or particlesnaturallyse'ek aplace ncar the wall ofthe container, the sediment dropping and accumulating in the bottom of the container,

and the water comparatively free of grease and foreign matter passing to the discharge and downwardly from the port 4, as clearly illustrated, admission to. this discharge chamberQ beingaiforded the water by a port 11 formed in the present instance by stopping the partition 10 short of a builtup section 12 in the bottom of the container.

By reason of. this arrangement of inlet and outlet ports, the'hot grease-carrying water entering the trap-and given the circular motion, as afore-described, will have an opportunity before reaching the port 11 at the bottom to cool and to deposit its mat of grease at'the centerand near the top of the tank, thereby insuring a high efficiency in the greaseextraction and preventing any material portion of the grease being carried through the outlets 11 and 4 with the water.

When the grease mat has reached a given size, it may be removed from thetrap by removing the cover 2 and merely dipping out the grease which will be found in the top of the container, the operation leaving no portionsadhering to the sides or walls of the container. After the mat has been re moved, the sedimentmay be collected'from .portfii througlr'a vertical shaft or chamber 9 formed by a partition 10 extending around the bottom of the container and examined for any articles that it may he desired to preserve. Replacement of the cover 2 places the device in condition for further operation.

The device "will be found useful 111 house drainage lines preventing the fouling of the soil pipes, and is particularly useful in rural sewage systems employing septic tanks and the like since grease tends to cut down the bacterialaction in the tank, and removal of the grease therefore being of considerable advantage. p

The device is also of particular value for the interception of grease from hotels,

restaurants, garages, creumeries, abattoir-s and dental laboratories, in which latter case the device recommends itself as providing for the interception o'li minute particles oi. precious metal which may berecovcred with the sediment accunuilating in the bottom of" the container. The trap also operate-:ivell in seashore drainage for intercepting sand entering the drains.

It will be understood that the device is capable of considerable modification without departure from the essential features of the invention as defined in the appended claims.

I claim: p p

1. A grease trap comprising a cylindri *al container having inlet and outlet 0 ienin s formed in the upper portion of itsside Wall, the outlet opening beingdisposed below said inletopening, a deflector formed interiorly of the container and enclosing said inlet opening, said deflector being closed at the bottom, a discharge opening formed 1n the side of said deflector adprcent to the wall 0t said containers, averticallv disposed par- A grease trap comprising a cylindrical container having an inlet and an outlet :lormcd in its side wall, the outlet being disposed. below the said inlet, a cylindrical well formed around the inlet opening on the in terior ot the container, said well being provided at one side and contiguous tothe wall of the container with a lateralopening whereby liquid Wlll flow through the inlet in a direction substantially tangential to the inner tlylflltlllibnl Willl of the container, a vertically disposed partition formed around the said outlet opening, said partition pro viding an enclosed passage extending down 1 \vardly in the container and terminating at a distance above the bottom thereof, and a raised portion formed in the bottom of the container below said partition, said raised portion terminating below the bottom of the said :iartition to provide a restricted opening there Jetween.

EDWIN A. BELL. 

